代表百分比，概率或库存水平 [英] Representing a percentage, probability, or stock level

问题描述

.NET 3.5中是否有一种简洁的方法来表示有界数字值？

Is there a succinct way to represent a bounded numeric value in .NET 3.5?

通过这种方式，我表示的是诸如百分比（0-100）概率的值（0-1）或库存水平（0或更高）。

By this I mean a value such as a percentage (0 - 100) probability (0 - 1) or stock level (0 or above).

我想要 ArgumentOutOfRangeException （或等价物） ），如果尝试了超出范围的分配。我还希望静态 MaxValue 和 MinValue 属性可用。

I would want a ArgumentOutOfRangeException (or equivalent) to be thrown if an out-of-range assignment was attempted. I would also want static MaxValue and MinValue properties to be available.

在评论中建议另一个SO问题：这是结构的很好用法。

推荐答案

我认为没有像Ada这样的内置方式范围关键字，但您可以轻松创建类似RestrictedRange< T>的类型。具有最小值和最大值以及当前值：

I don't think there is a built-in way like the Ada "range" keyword, but you could easily create a type like RestrictedRange<T> that had a min and max value along with the current value:

public class RestrictedRange<T> where T : IComparable
{        
    private T _Value;

    public T MinValue { get; private set; }
    public T MaxValue { get; private set; }

    public RestrictedRange(T minValue, T maxValue)
        : this(minValue, maxValue, minValue)
    {
    }

    public RestrictedRange(T minValue, T maxValue, T value)
    {
        if (minValue.CompareTo(maxValue) > 0)
        {
            throw new ArgumentOutOfRangeException("minValue");
        }

        this.MinValue = minValue;
        this.MaxValue = maxValue;
        this.Value = value;
    }

    public T Value
    {
        get
        {
            return _Value;
        }

        set
        {
            if ((0 < MinValue.CompareTo(value)) || (MaxValue.CompareTo(value) < 0))
            {
                throw new ArgumentOutOfRangeException("value");
            }
            _Value = value;
        }
    }

    public static implicit operator T(RestrictedRange<T> value)
    {
        return value.Value;
    }        

    public override string ToString()
    {
        return MinValue + " <= " + Value + " <= " + MaxValue;
    }
}

由于存在隐式转换，可以自动获取值，这将起作用：

Since there is an implicit conversion to automatically get the value, this will work:

var adultAge = new RestrictedRange<int>(18, 130, 21);
adultAge.Value++;
int currentAge = adultAge; // = 22

此外，您可以执行以下操作

In addition, you can do things like this

var stockLevel = new RestrictedRange<int>(0, 1000)
var percentage = new RestrictedRange<double>(0.0, 1.0);

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